Apparatus for regulating the pressure in step-transformers.



11310111511, APPARATUS FOR REGULATING THE PRESSURE 1N STEP TRANSFORMERS.

APPLICATION IILED MPT 21, 1911.

1,053,1 10. M Patented Feb. 11,1913.

Jig-j. I

WIT/7111555155 //v VF/VTOR subject To all whom it may concern NITEsTATEs PATENT F I E taunoLr RICHTER, or saunas-, seamingassreuonirroivrerrnr-scnwen'raxorrr WERKEG; M. 13.11., or BEnL-IN, GER ANAPPARATUS FOR REGULATTNG THE PRESSURE in s'riir-rnaNsnout/titles-."- 1

Be it known that I, RUnoLr RICHTER, a of the German Emperor, residing atGriinau, Mark, Germany, have invented new and useful Improvements inApparwius for Regulating the Pressure in Step-Transformers, of which thefollowing is a specification.

This invention has reference to the regu lation of pressure in steptransformers whereby injurious sparking at the switch ing points,"especially on opening the switches, is avoided.

It has heretofore been proposed to obtain 7 a gradual change in pressurein step-transformers while the several sections thereof are beingswitched on or oifyby the employment of an induction regulator, thepurpose being to prevent sparking at the. switch points, but such resulthas been only imperfectly obtained since on a pressure step beingswitched on the respective branch curi I rent starts at its full forceand onswitching off is interrupted at its full force. There existstherefore thewdanger that the contacts will weld together especiallywhen a contact drum is employed for switching. By the difliculty' 1sobviated by an arrangement whereby the switches when opened or closedare free or nearlyfree from current. i I

In the drawing Figure 1 is a diagram illustrating the invention. Fig. 2is a pres sure diagram for the secondary winding of the inductionregulator.-

.In' Fig. 1 the primary and secondary windings. of the malntransformer-are indicated at'P andS respectively. v For the sake ofsimplicity but two steps are shown in the secondary winding and theconnecting points or contacts are designated, a and 0 respectively, butit will of course beun'derstood that more'steps may be provided;

In the drawing, there is shown a-n induction regulator J needing nodetailed description and the primary and secondary windings of theregulator are designated 1" and 2' respectively while the primarywinding z" is connected to the ends of the secondary winding S of thesecondary winding 2' is connected by means of suitable conductors topoints on the secondary winding .S of the main transformer and also by athird conductor to one end of said secondary vice m being includedinthis third conductor Specification of Letters Patent. PatentedApplication filed September21', T911. Seria1No. 650,595. I

- and switches t and t being include .swit chedon, the pressure in thewinding 1'? main transformer and thewinding, the. translation defirstconductors.

p The main transformer having a primary winding P and'a'secondarywinding S has the secondary winding connected at one end to one side ofthe primary winding 2'", in this instance the rotatable member, of theinduction regulator J, while the other end of the secondaryis shown .asconnected to one terminal 'K" of a working circuit containing atranslating device mtypical of any means of utiliz ng the current in theworking circuit. Connected to-the other terminal K of .the workingcircuit is one end of the primary winding h. of an auxiliary transformerH, the other end of the winding it being connected tothe midpoint of theWind'- ing 11 which latter at one end is connected to the switch If,andat' the other endto the switch The transformer H has itssecond-arywinding 7L2 connected between that end of the windingS,connectedto the terminal K and the winding 2', the said windingifihaving an adjustable connection L for regulation. Itis to'beunderstood that the transformer- H actsas a booster with reference tothe electromot-ive force impressed on the primary a" of the potentialregulator J. Furthermore, it will be noted thatby displacing the contactpoint L so asto place additional windings of the secondary in circuitthe E. M. F. impressed in the primary ofthe potential regulator will beincreased. By means of th'isfiarrangement, when it is found that thepotential transfor1ner, J.- is ineffective to fully accomplish thepurpose desired the contact-L may bershifted ito-increase the efiect, Ifa new step,' -say, ,the second, fof the main transformer isjltoabe isincreased by displacing the pointaLfsufliciently so that on the closingof theswitch t little on no exchange of current takes place, and thenthe pressure in the winding 2' is reduced until the whole or the greaterpart of the working current flows through the switch t opened withoutinjurious sparking. In Fig. 2, the effective pressure in the secondarywinding of the induction regulator is plotted as a function of theadjustment of the induction regulator. The abscissa: indicate the whenthe switch 23' may be angle inclo-sed by the axes of the windings.

The maximum pressure E in the-regulator is now chosen larger than thepressure in the neighboring connections of the transformer which mayhave the value c. The load-of bot-h switches will be the same at theposition of the induction regulatorwvhere the pres sure in the secondarywinding of the induction regulator is also equal to e, that is to saythe switches in this position are equally loaded. To direct the currentto switch 25, n the pressure of the induction regulator 1s mcreased byreducing a. To direct current to switch. t the creasing a.

I claim:

'1. In a device of the k nd described, an

pressure is reduced by ining of the induction regulator to ing circuitincluding conductors arranged for conducting the working current throughsaid secondary winding and means for varying the pressure in saidsecondary wind :2. In a device of the kind described, an inductionregulator provided with primary and secondary windings a steptransformer provided with a plurality of tapping points,

means for connecting the secondary windthe tap-' ping points of the steptransformer, a working of the induction regulator to lug circuitincluding conductors arranged for conductingtthe working current throughsaid secondary winding, and means for regulating the, pressure 1n theprimary ,winding of the induction regulator.

3. Inadevice of the kind described, an in-'" d ction, regulator:provided with priniary I {0 and, secondary windings a step transformerprovided with a plurality 'of tapping points, means for connecting thesecondary w1ndv ing. or the induction regulator to the tap- .45 ngcircuit including conductors arranged winding. of the, inductionregulator, said regulating means consisting of an auxiliary transformerprovided with prin'iary and secondary windings, said regulating meansfurther including a shifting contact in eleccircuit.

pingpoints of the step transformer, a worktrical connection with theprimary winding of the induction regulator, said shifting contact beingadapted for connection to differentpoints of the secondary winding ofthe auxiliary transformer.

4. In a device of the 'kind described, an inductionregulator providedwith primary and secondary windings a step transformer provided with aplurality of tapping points, means for connecting the secondary windingof the induction regulator to the tapping points of the steptransformer, a working circuit including conductors arranged forconducting the working current through said secondary winding, and meansfor regulating the pressure in the primary winding ofthe induct-ionregulator, said regulatlng 'means consisting of an auxiliary transformerprovided with primary and secondary windings, said regulating meansfurther including a shifting contact in electrical connection with theprimary winding of the induction regulator, said shift ing contact beingadapted for connection to different points of the secondary winding ofthe auxiliary transformer, the primary winding of said auxiliarytransformer being connected'in circuit with the secondary winding of theregulator and the working 5. In a device of the kind described, an

induction regulator provided with primary and secondary windings asteptransformer provided With a plurality of tapping points, means forconnecting the 'secondary winding of the induction regulator to thetapping points of the step transformer, a working circuitincludingconductors arranged for conducting the working current through saidsecondary winding, meansfor varying the pressure in said secondarywinding, the conditions of the induction.regulator being chosen in sucha manner, that. the maximum pressure of the secondary winding is greaterthan. the pressure of ;-one transformer step. a y

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

v ,7 RUDOLF RICHTER.

Witnesses IIENRY HAsPEn, v \VoLnmrAR I-Lxurn

